Systems and methods to discriminate annular heavy fluids from cement

摘要

A cement bond logging method for wells containing heavy mud and cement is provided. Acoustic logging tool data from a well having material in the annular space between the casing and the formation is analyzed to map relationships between waveform amplitude, acoustic impedance, and impedance derivative of the material. Map zones representing fully bonded well regions and partially bonded well regions are identified. An image is generated from the log data corresponding to the identified map zones. A cement bond logging system including a memory having cement bond logging software and a processor coupled to the memory to execute the software is also provided.

主权项

1. A cement bond logging method comprising:
analyzing acoustic logging tool data from a well having material in an annular space between a formation and a casing to map relationships between waveform amplitude, acoustic impedance of the material, and impedance derivative of the material, wherein the material comprises heavy mud and cement; identifying map zones representing at least: fully bonded well regions and partially bonded well regions; generating an image from the log data corresponding to the identified map zones, said image identifying which of said map zones corresponds to various positions along the well.